Spark-plug attachment.



R. K. MCDOUGAL'.

SPARK PLUG ATTACHMENT.

APPLICATION FILED MAR. II. i912.

1.137,992. A Mmmm-M1915,

@me/Mofo view of the device pplieii te ,a spari: plug,

, new sind RQYDEN K. MGDOUGAL, 0F LNCOLN, NEBRASK.

SEK-PLG ATTCHIENT.

Specification of Letters Patent,

Appiiaeon mee Marci. ii, i912. serif-i1 ne. eeeee.

T0 all wfa om t may Concern it lineivn that I, BOYDEN K. MCDOUGAL,

will be ieaelened.

An important object of this inventien is to provide a device of 'the above mentioned shame yei, which may be quickly and easily placed upon the spaikplug, will remain in place theieon until removed, and muy be pleeecl upon spew-k plugs of cliilerent Sizes.

ii. Guit-hei' object of this, invention is to previ-cle :i device of the above mentioned eliareetei, which is simple in construction, eempeet in armiigement of parte, and cheap te manufacture.

Other objects enel advantages of the invention Willbe apparent during the coursev of Ytelleviiig; description.

' n the accompanying drewinge forming e part of this specification and in which like numerals are employed to designate like parte throughout the same, Figuie lis a, side 2 is a plan View of the saine, and, Fig. 3 iS e fent elevation el the device femeveel em thespai'e: plug.

f in the drawings wherein for the salte of illiistietien, l, have shown e prefefi'etl enst boaliment of my invention, the-numeieei l designates the outer sleeve 'or body portion i? thesperl plug, which is externally seiewthi'eedeel, shown, ier insettion Within e.

screw-tlieecled opening 2 formell through' the iieefl of eeylindei 3 of en explosive en- 'liie outer. sleeve l 1s uppei end W 'li en enlarge head 4.-, assliovv Extending leiigitudinally within the Sleeve l is en insulating plug 5, piepeily lielci therein by e clamping ring of gland 6. EX-

tending Within the insulating plug 5 is aY red terminating at its lower end in e v s'perliinv peint 7, which is insulated imm the sleeve This Spark-ing point; lies eleetrieel' connection at its upper enel with metallic heeel Sto which is connected a. feed Wire (not Shown) by Ineens oi a eontaet ei? in the county ei' Lancaster andv poiafcledl at 'its' .iverdlyg es shown 16.

clamping mitI 9. Electrically eenneeted" with the metallic oue): sleeve l is; e; eo, :ieting sparking peint l0, having its iee eed disposed a suitable disteiiee from the sperliing peint 7 to form en air gap tlierebeiiveen. The spark plug is sliowii enel described' Simply to more clearly illustrate the applic@ tion ofthe present invention, for Wliielireeson it is thought that no further detailed description oi' the @eine neefl he given. lit is te ee understood that the invention ieliiot in any sense i'estrieteel in use to the per* tieulei ferm of spark plug ehewn and: de scribed es it may be jusrt ne edvantegeouely applied to otherspeiil: plugs.

My sparkpl'ng atteehmeiit'eompiieee e handle il, which is formed ofeey'euitelle insulating mateiia-l, such as porcelain, Wood,

hard rubber' er iieeixf Rig-Milf; connected" with one enel of the handle ll is e body perfY tion l2, disposed et right angle theretmes shown. "llie honig neztion l2 liasits ievite'iI end portion 13 e slet eutweriily, as sliowzz.

't is time seen that the uppei end of the)-y liocly portien l2 is peeitionecl forwardly of the lower vendl. thereof. The 'body portie@ l2 may be formed ef :my suitelile metal which is a goed conductor of' elec.rieity.l .i

Rigidly connected with tlie upper' and lower ends of elle becly 'pertien l ere metall' small and large substantially llfe'nepecl Spring Clips oi baelets le' and l5, leespee.

tively.` The small clip oi' v'bieeltet lef: is adapted te engage with themeteliie hee,

`While the large clip oi: bracket l5 engages the head il. The large clip -01 beeele'; .l5-is longer than the upper, sifiell ,beiele li'lsutf by virtiieoi tlie feet 'that the l'owel peitien 13v of elle body per-tion l2 is e-set eiiti Waidly, as above stated, tlie ends of tlie' or 'bie'eiet l5 teiminate in substantiilly velle' seme plie-nel with Vends et' the elipei bracket lei. The springlelips er laieeltetsl and 1 5 lieve tliei .iee ends nent or eeive, eutr brackets have theiilsifeel nent inwardly Marthe-bully pertion l2, as Shown atl?.

vef circuit, tlie @pewter taliesflielelf ofthe.

These spring" clips The epemtion of' the eviee is es .fel-il 11 enel places the fiee or eiwedeede il@ ehe eyeing clips-oi'zgiacliete liz and l5 in engagement, 'eeelneetivelif/ith tlieleeee 8 and 4. i He' then pushes on the handle 10 to place these spring clips upon their respective heads. It is thus seen that the circuit will now be completed through the head 8, upper clip 14, body portion 12, 'lower clip 15, head 4: and back to the ground. The de- `vice will remain in place until removed by l the operator, which enables him .to examine the other cylinder r parts of the engine.

In this way be is able to nd out which cylinder is not operating. Assuming that there are two cylinders provided with spark plugs and one of these spark plugs is not operati 4 ing, it is obvious that as soon as my device is applied to the spark plug which is operating, such spark plug will be deadened and Having thus described my invention, I

claim In a device for electrically connecting the two metallic elements of a-spark plug, comprising a relatively rigid metallic body portion having its lower end laterally and outwardly oil set; an approximately U-shaped resilient metallic clamp attached to the upper end of the relatively rigid body portion; a second approximately U-shaped resilient metallic clamp attached to the lower outwardly off set end of the relatively rigid body portion and being substantially longer than the first named clamp whereby itsvfree end is substantially (zo-extensive in length with the corresponding end of the first named 'clamp and an insulating handle secured to the relatively. rigid body portion between the clamps, whereby the clamps may be readily detachably mounted upon and removed from the elements of the spark plug.

In testimony whereof I aix my signature in presence of two witnesses.

' R. K. MCDOUGAL. ,Witnessesz ADA W. GROSS,

IRA MILLER. 

